A block of mass 30 kg is being brought down by a chain. If the block acquires a speed of 40cm/s in dropping down 2m. The work done by the chain during the process will be..??
Answers
Answered by
131
Initial velocity, U = 0
Final velocity , V = 40 cm/s
= 0 .4m/s
so, now we can calculate by,
V²-U² = 2aS
S = 2m (given)
so by substituting the values we will get,
(0.04)² - (0)² = 2 x a x 2
a = 0.04 m/s^2
as we know,
Force = Mass * Acceleration
Force = 30 x 0.04
Force = 1.2 N
Force bcoz to gravity = 30 *X 9.81
= 294.3 N
Resultant Force = 294.3 – 1.2
= 293.1 N
Work Done = Force X distance covered
Work done = 294.3 X 2
= 586.2 Nm
Final velocity , V = 40 cm/s
= 0 .4m/s
so, now we can calculate by,
V²-U² = 2aS
S = 2m (given)
so by substituting the values we will get,
(0.04)² - (0)² = 2 x a x 2
a = 0.04 m/s^2
as we know,
Force = Mass * Acceleration
Force = 30 x 0.04
Force = 1.2 N
Force bcoz to gravity = 30 *X 9.81
= 294.3 N
Resultant Force = 294.3 – 1.2
= 293.1 N
Work Done = Force X distance covered
Work done = 294.3 X 2
= 586.2 Nm
anshgarg:
thats a one line answer LOL
use work energy theroem W(chain) + W(gravity) = 0.5mv^2
Answered by
0
Answer:
-586 joules of work is done by the chain
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